A British sniper currently holds the publicly known record for a confirmed kill shot. As a Corporal of Horse in the British Army, Craig Harrison used a .338 caliber L115A3 Long Range Rifle to shoot a man from 2,707 yards (1.54 miles) in Afghanistan in 2009.
Variability is a measure of the spread of a data set. Learn more about the different measures of variability including the range, variance, and standard deviation, and how they are used in the field of Psychology.
In other words, when we see variability in the data, we want to know where that variability comes from, and whether something important has happened. Variance is a statistic that allows us to answer these questions. The method for producing the answers is therefore called the Analysis of Variance, or ANOVA for short.